extracting tar.gz error

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http://forums.fedoraforum.org – cakephp.tar.gz is present in my /var/www/ folder but when i try to extract it using tar zxvf cakephp.tar.gz I get the following error. Please help as i am stucked. Also i am a newbie. [root@localhost www]# ls cakephp.tar.gz cgi-bin error html.ori icons manual usage [root@localhost www]# tar zxvf cakephp.tar.gz gzip: stdin: not in gzip format tar: Child returned status 1 tar: Error is not recoverable: exiting now Pleeeeeeeaaase help asap !!! (HowTos)